Tach on 1992 evinrude 88 spl

[Eshaw150]

I have a tach issue on a 92 88hp spl need to know what wire to check on the motor and what color and where it is and how to check it.

thanks all

 

[clanton]

Re: Tach on 1992 evinrude 88 spl

Gray wire on tach, app 8 volts with peakreading meter.

 

[Eshaw150]

Re: Tach on 1992 evinrude 88 spl

ok so check it at the tach end what if theres nothing there. Where do i need to check at the motor.

 

[clanton]

Re: Tach on 1992 evinrude 88 spl

Regulator.

 

[Eshaw150]

Re: Tach on 1992 evinrude 88 spl

same wire?

 

[clanton]

Re: Tach on 1992 evinrude 88 spl

Same gray wire.

 

[Eshaw150]

Re: Tach on 1992 evinrude 88 spl

thank you ill let u know by monday

 

[99yam40]

Re: Tach on 1992 evinrude 88 spl

Gray wire on tach, app 8 volts with peakreading meter.

I am sorry for butting into this post but,I am trying to understand Tachs, their signals, and how they work. From what I have found out so far is the tach signal is ac voltage from the alternator and it makes a difference as to how many poles the alternator has, making me believe the wave form has something to do with the signal also. Most tachs use the unrectified signal but this one uses a regulated signal.

Could you elaborate on the 8 volts?
At what RPM would you see 8 volts and if it is coming from a voltage regulator is the signal AC or DC?
Is there a ratio of volts to RPM that is standard for most tachs? Or is it the pulses that give the RPM?